Low-temperature synthesis of highly crystallized LiMn2O4 from alpha manganese dioxide nanorods

Fang, Haisheng; Li, Liping; Yang, Yong; Yan, Guofeng; Li, Guangshe

doi:10.1016/j.jpowsour.2008.04.011

Cited by 34 publications

(33 citation statements)

References 29 publications

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“…Coupled with relatively low production costs and appreciable electrochemical performance at high discharge rates and elevated temperatures, LiMn2O4 is touted as a potential driver of future EV/HEV battery packs, notably against favourable LiFePO4 candidates [264]. Recent nanostructured morphologies of note include nanowires [265][266][267], nanorods [268][269][270][271][272], nanotubes [273], nanoparticles [269,[274][275][276] and ordered meso/porous electrodes [277,278]. Okubo et al [275] have demonstrated an important size-effect occurring in LiMn2O4 particles, confirming that bulk particle sizes are unable to achieve complete lithiation (up to Li2Mn2O4), due to their lower surface area.…”

Section: Limnxoymentioning

confidence: 99%

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

et al. 2013

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Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin ABSTRACTThe performance of the lithium-ion cell is heavily dependent on the ability of the host electrodes to accommodate and release Li + ions from the local structure. While the choice of electrode materials may define parameters such as cell potential and capacity, the process of intercalation may be physically limited by the rate of solid-state Li + diffusion. Increased diffusion rates in lithium-ion electrodes may be achieved through a reduction in the diffusion path, accomplished by a scaling of the respective electrode dimensions.In addition, some electrodes may undergo large volume changes associated with charging and discharging, the strain of which, may be better accommodated through nanostructuring. Failure of the host to accommodate such volume changes may lead to pulverisation of the local structure and a rapid loss of capacity. In this review article, we seek to highlight a number of significant gains in the development of nanostructured lithium-ion battery architectures (both anode and cathode), as drivers of potential next-generation electrochemical energy storage devices.

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Section: Limnxoymentioning

confidence: 99%

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

et al. 2013

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“…[1][2][3] It is consumer demand that drives research efforts for batteries with high energy density, fast recharging times, and 20 excellent cycling stability. Great efforts have been made to develop competitive electrode materials for rechargeable lithium batteries with superior electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

et al. 2012

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, HK (2012), K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries, RSC Advances, 2(4), pp. 1643-1649. K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries Abstract K 0.25 Mn 2 O 4 microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120 degrees C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity. microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120°C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge 10 process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity.

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“…The procedure to determine the average manganese valence consisted in directly transferring [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . In this case, the blank was a solution containing only NaCH 3 COO and 1,10-phenanthroline, obtained by adding 10 mL of aqueous 10% (m/m) NaCH 3 COO and 0.1% (m/m) 1,10-phenanthroline solutions to a 50 mL volumetric flask and completing its volume with deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…7 This capacity loss is usually correlated with the (i) Jahn-Teller effect, which occurs mainly during charge-discharge at 3 V vs. Li/Li + , 3,8 (ii) manganese dissolution caused by the disproportionation reaction 2Mn 3+ (s) → Mn 4+ (s) + Mn 2+ (slv), 3,9 and (iii) instability of the spinel structure at the end of the charging process due to oxygen loss. 3 Different experimental strategies have been employed to minimize these possible problems: change of precursors and synthesis conditions, 10,11 change of size and morphology of the spinel particles, 12,13 coating of the spinel particles to prevent manganese dissolution, [14][15][16] trapping of the Mn cation, 17 and doping of the spinel Li x Mn 2 O 4 with different cations and anions. 3,7,18 This last strategy is one of the most employed and cited in the current literature.…”

Section: Introductionmentioning

confidence: 99%

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

Silva¹,

Silva²,

Biaggio³

et al. 2017

J. Braz. Chem. Soc.

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An alternative, friendlier methodology for the determination of the average manganese valence (ν) of manganese oxides (mainly pure and doped spinels) is presented. This methodology is based on the facile determination of the concentration of Mn 2+ and Fe 2+ ions by atomic absorption spectrometry (AAS) and molecular absorption spectrophotometry (MAS), respectively. Prior to this determination, the manganese oxides are reacted with an acidic solution containing Fe 2+ ions, when all Mn ν+ ions are reduced to Mn 2+. Then, the concentration of Mn 2+ ions is obtained directly by AAS, whereas that of Fe 2+ ions is obtained by MAS after their complexation with o-phenanthroline. Using this methodology, the obtained mean (n = 3) ν values for the stoichiometric oxides Mn 2 O 3 and Mn 3 O 4 are 2.98 ± 0.01 and 2.66 ± 0.01, respectively; their precision is a clear evidence of the suitability of the here-proposed methodology. Additionally, a precise mean ν value (3.46 ± 0.01; n = 3) is also obtained for the spinel Li 1.05 Mn 2 O 4 , whereas a higher ν value (3.52 and 3.53; n = 2) is obtained for the doped spinel Li 1.05 Mn 1.98 Al 0.02 O 3.98 S 0.02 , evidencing that effective doping has been indeed attained. This novel methodology is easily applicable for Mn oxides in electrode materials of many energy storage devices. Keywords IntroductionIn the last decade, the popularization of portable electronic devices has increased, leading to a growing demand for lithium ion batteries (LIBs). In this scenario, some oxides have been targeted for studying and testing as cathode materials in LIBs; the spinel lithium manganese oxide (Li x Mn 2 O 4 ) is one of these oxides.1,2 The use of this spinel is favored by factors such as the manganese abundance, non-toxicity, and low cost, as well as the possibility of insertion of two lithium ions per formula unit.3 When 0 ≤ x ≤ 1, Li 3 Therefore, the average manganese valence of doped spinels is a useful parameter because it can provide information on their effective doping and structural changes.As far as we could ascertain, the most common approach to determine the average manganese valence of manganese oxides has been the Vetter and Jaeger's method, 33 employs an acid solution of potassium iodide to reduce all Mn ions in the manganese oxides to Mn 2+ ions. In this process, iodine is formed and quantified by titration with a sodium thiosulfate solution, while Mn 2+ ions are determined by titration with an EDTA solution. Titration of iodine was also proposed by Licci et al. 34 to determine the average manganese valence in Mn-La complexes. Firstly, after the Mn-La complex is dissolved in dilute H 2 SO 4 , the Mn ions are oxidized to permanganate ions by adding an excess of solid bismuthate, followed by the addition of an iodide solution (also in excess) that converts all permanganate ions into Mn 2+ ions, yielding iodine. In a parallel step, the Mn-La complex is reacted directly with an iodide solution, also yielding iodine. In both cases, the iodine is amperometrically titrated with a thio...

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Low-temperature synthesis of highly crystallized LiMn2O4 from alpha manganese dioxide nanorods

Cited by 34 publications

References 29 publications

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

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Low-temperature synthesis of highly crystallized LiMn2O4 from alpha manganese dioxide nanorods

Cited by 34 publications

References 29 publications

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

K0.25Mn2O4nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

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K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries